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 ###Instrução: Quantos carros Gregg Mixon possui?
 ###Tabelas: CREATE TABLE full-time_entries (full-time_entries_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Car(s) VARCHAR, # INT, Driver(s) VARCHAR, Primary Sponsor(s) VARCHAR, Listed Owner(s) VARCHAR, Crew Chief VARCHAR) CREATE TABLE main_setlist (main_setlist_id AUTO_INCREMENT PRIMARY KEY, Year INT, Song VARCHAR, Artist VARCHAR, Genre VARCHAR, Band Tour Venue VARCHAR, Exportable? VARCHAR) CREATE TABLE solo (solo_id AUTO_INCREMENT PRIMARY KEY, Year INT, Title VARCHAR, U.S. VARCHAR, U.S. R&B VARCHAR, U.S. dance VARCHAR) CREATE TABLE lpga_tour_8 (lpga_tour_8_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Winning score VARCHAR, Margin of victory VARCHAR, Runner(s)-up VARCHAR) CREATE TABLE lpga_tour_career_summary (lpga_tour_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year INT, Tournaments played INT, Cuts made* INT, Wins INT, Top 10s INT, Best finish VARCHAR, Earnings ($) INT, Money list rank VARCHAR, Scoring average INT, Scoring rank VARCHAR)  
SELECT COUNT Car(s) FROM full-time_entries WHERE Listed Owner(s) = Gregg Mixon